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## Homework Statement

A ball is thrown downward from a height of 30m at 8m/s. How long until it hits the ground?

(Air resistance is negligible and gravity is 9.8m/s

## Homework Equations

I tried deltaX=Vi+(1/2)a(t^2) and came out with 2.12, but the solution says it's 1.79.

## The Attempt at a Solution

30=8+(1/2)(9.8)(t^2)

22=4.9(t^2)

sqrt4.49=sqrt(t^2)

t=2.12